Fragile X syndrome is a common inherited form of mental retardation caused by the lack of fragile X mental retardation protein (FMRP) because of Fmr1 gene silencing. Serotonin (5-HT) is significantly increased in the null mutants of Drosophila Fmr1. and elevated 5-HT brain levels result in cognitive and behavioral deficits in human patients. The serotonin type 2A receptor (5-HT2AR) is... https://www.roneverhart.com/Gap-Kad-n-Sneaker-p2955/